Owner Stephen Ross said this week that re-signing Miami's core players was "very important."
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"Certainly, those players that we know that are coming up we all know we want to retain them. We have to make sure we're in a position to do that," Ross said.
Long, the first overall pick in the 2008 NFL Draft, is seeking a deal that would make him the league's highest-paid offensive lineman. Cleveland's Joe Thomas currently holds that distinction -- the seven-year extension he signed last August could be worth up to $84 million.
Hartline, a fourth-round pick in 2009, has 109 catches for 1,670 yards in his three seasons.